Da: Equipment for explosive dust environment, with “very high” protection level, is not the ignition source under normal operation, expected failure or rare failure.
Db: equipment for explosive dust environment, with “high” protection level, is not the ignition source under normal operation or expected failure conditions.
Dc: equipment used in explosive dust environment, with “general” protection level, is not an ignition source in normal operation, and some additional protective measures can also be taken to ensure that effective ignition will not be formed in case of expected frequent occurrence of ignition source (such as lamp failure).
Marst Safety Equopment (Tianjin) Co., Ltd, Rita, bradia@chinawelken.com, 86-17827811689
Post time: Feb-08-2023
